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Bard part number S910-1622 is a Damper Step Control Assembly used to command and position an outdoor air or economizer damper in compatible Bard wall mounted HVAC equipment. When a unit struggles to regulate ventilation airflow, maintain stable space temperature, or respond correctly during economizer operation, this OEM Bard control assembly is the correct type of replacement to restore proper stepped damper movement and consistent airflow control. Verify compatibility by matching S910-1622 to your Bard model and serial information and compare the existing control and wiring connections before ordering, since damper control setups can vary by unit configuration.